British Airways owner IAG has said it is "ready to fly" and has called for government action to restart international travel.
Citing a "high level" of pent-up demand, the airline group called for "travel corridors without restrictions" between certain countries.Some foreign holidays could be allowed when England's lockdown rules ease.
Details of a "green list" of countries with the fewest travel rules are expected soon.
The airline group has been hit hard by the coronavirus crisis, with revenue plunging as many of its planes have been grounded.
IAG reported revenues of €968m (£840m) for the first three months of the year, down from €4.6bn for the same period last year, and an operating loss of €1,07bn.
The measures of the airline group demanded were:Travel corridors without restrictions between countries with successful vaccination rollouts and effective testing such us the UK and the US
Affordable, simple and proportionate testing to replace quarantine and multi-layered testing
Well-staffed borders using contactless technology including e-gates to ensure a safe, smooth flow of people and frictionless travel
Digital passes for testing and vaccination documentation to facilitate international travel.